#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <stdlib.h>
int main()
{
    pid_t id = fork();
    if(id == 0)
    {
        while(1)
        {
            printf("我是子进程，pid：%d, ppid: %d\n",getpid(),getppid());
            sleep(5);
            exit(1);

        }
    }
    else if(id < 0)
    {
        return 0;
    }
    else
    {
        while(1)
        {
            printf("我是父进程, pid: %d, ppid: %d\n",getpid(),getppid());
            sleep(2);
        }
    }
    return 0;
}
